Two pipes can fill a tank in $20$ and $24$ $minutes$ respectively and a waste pipe can empty $3$ $gallons$ per $minute$. All the three pipes working together can fill the tank in $15$ $minutes$. The capacity of the tank is?
- A$60 \text{ gallons}$
- B$100 \text{ gallons}$
- C$120 \text{ gallons}$
- D$180 \text{ gallons}$
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